726436644 has 12 divisors (see below), whose sum is σ = 1695018864. Its totient is φ = 242145544.

The previous prime is 726436637. The next prime is 726436661. The reversal of 726436644 is 446634627.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×726436644³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 726436596 and 726436605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30268182 + ... + 30268205.

It is an arithmetic number, because the mean of its divisors is an integer number (141251572).

Almost surely, 2^726436644 is an apocalyptic number.

It is an amenable number.

726436644 is an abundant number, since it is smaller than the sum of its proper divisors (968582220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726436644 is a wasteful number, since it uses less digits than its factorization.

726436644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60536394 (or 60536392 counting only the distinct ones).

The product of its digits is 580608, while the sum is 42.

The square root of 726436644 is about 26952.4886420531. The cubic root of 726436644 is about 898.9438821559.

The spelling of 726436644 in words is "seven hundred twenty-six million, four hundred thirty-six thousand, six hundred forty-four".